What's the correct way to make before_validation, etc. work in an ActiveModel

Question

Should I extend or include ActiveModel:Validations:Callbacks:ClassMethods or ActiveModel:Validations:Callbacks?

Answer 1

I got it to work like this:

class Foo
  extend ActiveModel::Callbacks
  include ActiveModel::Validations
  include ActiveModel::Validations::Callbacks

  before_validation :bar

  def bar
    # callback logic here
  end
end

It's important that you have everything in that order.